They found that those children who had a lower respiratory viral infection during their first year of life and developed sensitivity to an allergen before they were two were three to four times more likely to suffer from asthma at the age of five.

• 他们发现那些在1岁内得过下呼吸道病毒感染和2岁内对某过敏原产生了过敏的的孩子，在5岁时患哮喘的可能性要增加3到4倍。